一种新型非线性PLL模型及其在毫米波集成防撞雷达中的应用

NOVEL NONLINEAR PLL MODEL AND ITS APPLICATION IN 8MM INTEGRATED AUTOMOBILE ANTI-COLLISION RADAR

提出了一种新的非线性PLL用于VCO的非线性补偿 ,利用声表面波延迟线来实现延时混频 ,并将混频后的中频信号锁定PLL结构 .深入分析了这种PLL的环路相位模型 ,使用AgilentADS软件对锁相环路进行了仿真 ,验证了所提出的环路相位模型的准确性 .所有的理论推导和仿真结果表明 ,建立的PLL环路相位模型可以用来实现防撞雷达中VCO(电压控制振荡器 )的线性化 ,准确可靠 。

A novel nonlinear PLL which can be used in VCO nonlinearity compensation was presented. By using the SAW (Surface Acoustic Wave) delay line to delay the FMCW signal, the IF signal can be locked on a reference frequency after mixing with them delayed VCO signal frequency and the undelayed. Based on this idea, the loop phase model of this PLL was analyzed and simulated by using Agilent ADS. The CAD simulation results show that this kind of PLL can be used in VCO ( Voltage Controlled Oscillator) nonlinearity compensation circuit conveniently.